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Classiﬁcation of trees
Principal parts of a tree
Origin and development of secondary tissues
11 other sections not shown
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absent aperture bordered pits cambium Canada canals cells high cells wide clusters color common Cross section showing Cupressaceae Cypress deﬁnite dicotyledonous dicotyledonous woods distinct early wood eastern fairly ﬁber-tracheids ﬁbers ﬁelds ﬁgure ﬁne ﬁrst ﬂattened genera grain Growth rings Gymnosperms Hardwood Record Heartwood identiﬁcation intercellular late wood Lauraceae layer Leguminosae lens lumber Maple North America occur Oregon Paciﬁc parenchyma strands phloem Pinus pit-pairs pith Platanus Quercus Radial section ray cells ray parenchyma cells Ray tracheids reddish brown resin resin ducts rows sapwood scalariform scent secondary wall Shortleaf Pine sometimes southern species speciﬁc gravity spiral thickenings Spruce stem structure Tangential section Taxodium Texture thick Tilia timber tissue tracheids Tropical Woods Tsuga tyloses U. S. Dept U. S. Forest Service uniseriate usually vessel members Western Hemlock Western red cedar White Pine wood ﬁbers wood parenchyma Wood-using industries woods e.g. xylem Yellow